If my recollection is correct, the "File Save As" crash happened when I attempted to use the system Wx supplied with Snow Leopard. On Snow Leopard,

/usr/bin/wx-config --version

gives

2.8.8

I think this happens with both perl 5.12 and 5.14. Also, I think this happened with the non-gtk versions of Wx that I tried (from fink). I went through many iterations of testing and combinations of perl and Wx in order to get this working so my recollection may not be entirely accurate.